Re: [PATCH 5/5 v3] ARM: at91: sam9x5 add i2c DT support

On 11:12 Thu 08 Mar     , Rob Herring wrote:

On 03/08/2012 02:50 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:

quoted

For now on use i2c-gpio driver on the same pin as the hardware IP.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
Cc: Nicolas Ferre <redacted>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
v3:

	update i2c binding (Rob comments)

Best Regards,
J.
 arch/arm/boot/dts/at91sam9x5.dtsi |   39 +++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/at91sam9x5.dtsi b/arch/arm/boot/dts/at91sam9x5.dtsi
index c294657..fdd1ac6 100644
--- a/arch/arm/boot/dts/at91sam9x5.dtsi
+++ b/arch/arm/boot/dts/at91sam9x5.dtsi

@@ -188,4 +188,43 @@
 			status = "disabled";
 		};
 	};
+
+	i2c-gpio@0 {
+		compatible = "i2c-gpio";
+		gpios = <&pioA 30 0 /* sda */
+			 &pioA 31 0 /* scl */
+			>;
+		i2c-gpio,sda-open-drain;
+		i2c-gpio,scl-open-drain;
+		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "disabled";
+	};
+
+	i2c-gpio@1 {
+		compatible = "i2c-gpio";
+		gpios = <&pioC 0 0 /* sda */
+			 &pioC 1 0 /* scl */
+			>;
+		i2c-gpio,sda-open-drain;
+		i2c-gpio,scl-open-drain;
+		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "disabled";
+	};
+
+	i2c-gpio@2 {
+		compatible = "i2c-gpio";
+		gpios = <&pioB 4 0 /* sda */
+			 &pioB 5 0 /* scl */
+			>;
+		i2c-gpio,sda-open-drain;
+		i2c-gpio,scl-open-drain;
+		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "disabled";
+	};

If these are just any random gpio lines, it seems strange to define
these in a SOC dtsi and then disable them.

they are not, they are the same pin as the i2c hardware IP.

Today the hw driver is not ready or will not work correctly (IP issue)

On hardware design we use the I2C pin but can not use the hw driver

Best Regards,
J.